cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A333177 a(n) = Sum_{d|n, gcd(d, n/d) = 1} (-1)^omega(n/d) * prime(d).

Table of values

n a(n)
1 2
2 1
3 3
4 5
5 9
6 7
7 15
8 17
9 21
10 17
11 29
12 27
13 39
14 25
15 33
16 51
17 57
18 37
19 65
20 55
21 53
22 47
23 81
24 67
25 95
26 59
27 101
28 85
29 107
30 41
31 125
32 129
33 103
34 79
35 123
36 123
37 155
38 95
39 123
40 145
41 177
42 75
43 189
44 157
45 165
46 115
47 209
48 167
49 225
50 131
51 171
52 193
53 239
54 147
55 217
56 229
57 199
58 161
59 275
60 147

List of values

[2, 1, 3, 5, 9, 7, 15, 17, 21, 17, 29, 27, 39, 25, 33, 51, 57, 37, 65, 55, 53, 47, 81, 67, 95, 59, 101, 85, 107, 41, 125, 129, 103, 79, 123, 123, 155, 95, 123, 145, 177, 75, 189, 157, 165, 115, 209, 167, 225, 131, 171, 193, 239, 147, 217, 229, 199, 161, 275, 147]